ABSTRACT
BACKGROUND: Little information is available regarding the effect of dietary fibers added into edible coatings on quality attributes of ready-to-eat fruits. The aim of this study was to evaluate the effects of sodium alginate (AL) and chitosan (CH) edible coatings enriched with four different dietary fibers (apple fiber, orange fiber, inulin and oligofructose) on microbiological, nutritional, physico-chemical and sensorial properties of ready-to-eat fresh blueberries stored for 18 days at 5 °C. RESULTS: The most encouraging results were found for CH coatings (with and without fibers) which significantly inhibited the growth of mesophilic bacteria and yeasts/molds (reductions up to 1.9 log CFU g-1 ), reduced decay rate by more than 50%, enhanced antioxidant properties, retained fruit firmness, delayed off-odor development and improved overall visual quality of blueberries. Oligofructose and orange fiber added to CH coatings enhanced antioxidant properties of fruits and allowed higher reductions in yeast/mold counts compared to the use of CH alone. CH-based coatings enriched with inulin, oligofructose and apple fiber extended sensory shelf life of blueberries by 6 days. AL coatings (with and without fiber) allowed delaying fungal decay and also retaining antioxidant properties but did not improve the microbiological and sensory quality of fruits. CONCLUSION: The results proved that fiber-enriched CH treatments allowed the maintenance of freshness and the improvement of the quality of ready-to-eat blueberries. It might be an interesting option to offer consumers a healthy product with prebiotic potential and an extended shelf life. © 2017 Society of Chemical Industry.
Subject(s)
Blueberry Plants/chemistry , Food Preservation/methods , Fruit/chemistry , Plant Extracts/analysis , Polysaccharides/chemistry , Prebiotics/analysis , Bacteria/growth & development , Blueberry Plants/microbiology , Dietary Fiber/analysis , Fast Foods/analysis , Food Contamination/analysis , Food Contamination/prevention & control , Fruit/microbiology , Fungi/growth & development , Quality ControlABSTRACT
BACKGROUND: Pulsed light (PL) treatments stand as an alternative for the shelf-life extension of fresh-cut products. The antimicrobial effects of PL are well known; however, its influence on quality attributes needs to be assessed. This study was aimed at evaluating the application of PL treatments in combination with pectin-based edible coatings enriched with dietary fiber for the preservation of fresh-cut apples. RESULTS: Dipping of fresh-cut apples in ascorbic acid/calcium chloride solution prior to pectin coating and PL treatments was effective to minimize browning and softening of apple surfaces. Incorporation of fiber in the pectin coating did not cause any change in microbial loads and sensory acceptability of apple cubes. Pectin-coated PL-treated apple pieces exhibited significantly higher antioxidant activity values than fresh and PL control samples. At the end of storage, the combination of both treatments resulted in an almost 2 log CFU g-1 reduction of microbial counts. Sensory attribute scores did not fall below the rejection limit throughout 14 days, although the presence of off-odors limited the acceptability of the pectin-coated samples. CONCLUSION: The results demonstrate that PL treatments applied to pectin-coated fresh-cut apples may be used to maintain quality attributes, thus conferring prebiotic potential and extending the shelf-life of the product. © 2016 Society of Chemical Industry.
Subject(s)
Food Preservation/methods , Food Technology/methods , Fruit , Light , Malus , Pectins , Adult , Antioxidants/analysis , Ascorbic Acid , Bacterial Load , Calcium Chloride , Dietary Fiber , Food Preservation/instrumentation , Food Quality , Fruit/microbiology , Humans , Maillard Reaction , Sensation , SolutionsABSTRACT
BACKGROUND: The combined effects of bioactive agents (tea tree essential oil, propolis extract and gallic acid) and storage temperature on the microbiological and sensory quality of fresh-cut mixed vegetables for soup (celery, leek and butternut squash) were studied with the objective of preserving its quality and safety. RESULTS: Refrigeration temperature was confirmed as the main factor to limit the growth of spoilage and pathogenic microorganisms. Biopreservatives applied on mixed vegetables were effective only when combined with optimal refrigeration temperature (5 °C). Bioactive compounds showed slight effectiveness in controlling the microbiota present in mixed vegetables, although coliforms were greatly reduced by gallic acid and propolis treatments, achieving 0.5-2 log unit reductions during storage. Also, these agents showed antimicrobial activity against endogenous Escherichia coli and inoculated E. coli O157:H7, exerting a bacteriostatic effect and reducing population counts by 0.9-1.2 log CFU g(-1) at 10 days of refrigerated storage. The combination of propolis treatment with refrigerated storage conditions effectively preserved the sensory quality and prolonged the sensory shelf life of fresh-cut mixed vegetables by 3 days. CONCLUSION: The use of natural agents such as propolis extract to preserve the quality and safety of mixed vegetables for soup might be an interesting option to address the concerns of the consumer about the use of synthetic chemical antimicrobials potentially harmful to health.
Subject(s)
Food Preservatives/chemistry , Food Quality , Food Storage , Plant Extracts/chemistry , Propolis/chemistry , Tea Tree Oil/chemistry , Vegetable Products/analysis , Anti-Bacterial Agents/adverse effects , Anti-Bacterial Agents/chemistry , Argentina , Chemical Phenomena , Colony Count, Microbial , Enterobacteriaceae/growth & development , Enterobacteriaceae/isolation & purification , Food Handling , Food Preservatives/adverse effects , Gallic Acid/adverse effects , Gallic Acid/chemistry , Humans , Maillard Reaction , Microbial Viability , Odorants , Plant Extracts/adverse effects , Refrigeration , Sensation , Tea Tree Oil/adverse effects , Vegetable Products/microbiologyABSTRACT
Edible films can be used as carriers for antimicrobial compounds to assure food safety and quality; in addition, pathogenesis of food bacteria is related to a cell to cell communication mechanism called quorum sensing (QS). Oregano essential oil (OEO) has proved to be useful as food antimicrobial; however, its food applications can be compromised by the volatile character of its active constituents. Therefore, formulation of edible films containing OEO can be an alternative to improve its food usages. QS inhibitory activity of OEO and pectin-OEO films was evaluated using Chromobacterium violaceum as bacterial model. Additionally, antibacterial activity was tested against Escherichia coli O157:H7, Salmonella Choleraesuis, Staphylococcus aureus, and Listeria monocytogenes. OEO was effective to inhibit bacterial growth at MIC of 0.24 mg/mL for all tested bacteria and MBC of 0.24, 0.24, 0.48, and 0.24 mg/mL against E. coli O157:H7, S. Choleraesuis, S. aureus, and L. monocytogenes, respectively. Pectin-films incorporated with 36.1 and 25.9 mg/mL of OEO showed inhibition diameters of 16.3 and 15.2 mm for E. coli O157:H7; 18.1 and 24.2 mm for S. Choleraesuis; 20.8 and 20.3 mm for S. aureus; 21.3 and 19.3 mm for L. monocytogenes, respectively. Pectin-OEO film (15.7 mg/mL) was effective against E. coli O157:H7 (9.3 mm), S. aureus (9.7 mm), and L. monocytogenes (9.2 mm), but not for S. Choleraesuis. All concentrations of OEO (0.0156, 0.0312, 0.0625 and 0.125 mg/mL) and pectin-OEO films (15.7, 25.9 and 36.1 mg/mL) showed a significant anti-QS activity expressed as inhibition of violacein production by C. violaceum. Additionally, the application of pectin-OEO films was effective reducing total coliforms, yeast, and molds of shrimp and cucumber slices stored at 4°C during 15 d. These results demonstrated the potential of pectin films enriched with OEO as food related microorganisms and QS inhibitors.
Subject(s)
Botulinum Toxins/administration & dosage , Botulinum Toxins/therapeutic use , Movement Disorders/drug therapy , Pain/drug therapy , Adult , Extremities , Foot , Humans , Injections , Male , Movement Disorders/complications , Muscle Weakness/etiology , Muscle, Skeletal , Neurologic Examination , Pain/complications , ToesABSTRACT
We present a retrospective review of cases of painful legs and moving toes (PLMT) syndrome. Out of 4,780 database patients with movement disorders diagnosed at Mayo Clinic Arizona from 1996 to 2006, we identified 14 cases of PLMT and its variants (6 men, 8 women). Ages ranged from 25 to 84 years (mean, 69 years). Movements were bilateral in 12 and unilateral in 2. Pain preceding the movements was most commonly burning; movements consisted of flexion/extension, abduction/adduction, fanning, or clawing of toes, fingers, and sometimes the foot or hand. The most common predisposing factors were neuropathy and radiculopathy. Surface electromyography showed movements suggestive of both chorea and dystonia. Movements were partially suppressible and were diminished but still apparent during light sleep. GABAergic agents were most effective in controlling the pain and the movements.
Subject(s)
Electrophysiology , Leg/physiopathology , Pain/pathology , Pain/physiopathology , Toes/physiopathology , Adult , Aged , Aged, 80 and over , Electromyography/methods , Female , Humans , Male , Middle Aged , Movement Disorders/drug therapy , Movement Disorders/physiopathology , Pain/drug therapy , Pain/etiology , Retrospective StudiesABSTRACT
In 1817, James Parkinson formally described the shaking palsy that is now known as idiopathic Parkinson's disease (PD). Symptoms of PD, however, existed for thousands of years before that time. Descriptions evolved significantly until the term PARKINSONISM was eventually coined to describe neurologic disorders characterized by the presence of tremor, rigidity, and bradykinesia in addition to loss of postural reflexes and freezing. In this article, we present some useful clinical pearls in distinguishing idiopathic PD from atypical parkinsonism or drug-induced parkinsonism.
Subject(s)
Parkinson Disease/diagnosis , Parkinsonian Disorders/diagnosis , Aged , Diagnosis, Differential , Female , Humans , MaleABSTRACT
Concrete structural features of integrin alpha(IIb)beta(3) on the surface of platelets (at rest and after activation) have been obtained from epitope maps based on cross-competition among monoclonal antibodies directed against the alpha(IIb) subunit calf-2 domain and the beta(3) subunit betaA domain of alpha(IIb)beta(3). At rest, the observed intersubunit interface is formed by the sequence stretches beta(3)-(150-216), alpha(IIb) light chain-(1-92), and alpha(IIb) heavy chain-(826-856); and the alpha(IIb) interchain interface is formed by the two latter sequence stretches, disulfide-bonded between alpha(IIb) heavy chain Cys(826) and alpha(IIb) light chain Cys(9). These structural features agree with those observed in the alpha(IIb)beta(3) rudimentary connectivity map in solution and with the alpha(v)beta(3) V-shaped crystal structure (Xiong, J.-P., Zhang, R., Dunker, R., Scott, D. L., Joachimiak, A., Goodman, S. L., and Arnaout, M. A. (2001) Science 294, 339-345), but they disagree with the domain disposition suggested by the actual ultrastructural model. The epitope maps in platelets activated by ADP, thrombin receptor activation peptide, and arachidonic acid differ not only from those in platelets at rest, but also among themselves. The structural rearrangements observed confirm the presence in activated platelets of the crystallographically observed knee and argue against the switchblade mechanism proposed for activation (Beglova, N., Blacklow, S. C., Takagi, J., and Springer, T. A. (2002) Nat. Struct. Biol. 9, 282-287), demonstrate the existence of alpha(IIb)beta(3) agonist-specific activation states, explain the specificity for ligand binding and functional inhibition for some agonists, and predict the existence of agonist-specific final effectors and receptor activation mechanisms. The distinct non-reciprocal competition patterns observed at rest and after activation support the agonist-specific activation states and the existence of intrasubunit and intersubunit allosteric effects, previously proposed as the mechanism for alpha(IIb)beta(3) transmembrane activation.
Subject(s)
Antibodies, Monoclonal/chemistry , Platelet Activation , Platelet Glycoprotein GPIIb-IIIa Complex/chemistry , Allosteric Site , Antibodies, Monoclonal/metabolism , Antigens/chemistry , Binding, Competitive , Blood Platelets/metabolism , Cell Membrane/metabolism , Epitopes/chemistry , Humans , Immunoblotting , Kinetics , Ligands , Models, Molecular , Platelet Glycoprotein GPIIb-IIIa Complex/metabolism , Protein Binding , Protein Conformation , Protein Structure, TertiaryABSTRACT
El objetivo de este trabajo es determinar la eficacia de la biorretroalimentación en el tratamiento de la incontinencia fecal. Entre mayo de 1991 y mayo de 1993 se evaluaron en forma restrospectiva 36 pacientes, con una edad promedio de 58 años; 22 eran mujeres. Las causas de la incontinencia eran: idiopática en 16, trauma obstétrico en 10, post cesárea en 5 y neurológicas en 5. La técnica empleada fue de manometría anorectal y retro alimentación, complementando con un sistema de balones conectados a los esfínteres anales y a la ampolla rectal. Se evaluó la respuesta como curación, mejoría o fracaso terapéutico. 2 pacientes abandonaron el tratamiento. De los 34 restantes, 17 (50 por ciento) se curaron, 15 (44 por ciento) mejoraron y no hubo respuesta (fracaso terapéutico) en 2. Sólo el grupo de pacientes curados demostró una contracción voluntaria completa con significación clínica estadística. Este tipo de tratamiento es eficaz, no traumático y sencillo de realizar por los pacientes con incontinencia fecal (AU)
Subject(s)
Humans , Male , Female , Adolescent , Adult , Middle Aged , Aged , Fecal Incontinence/therapy , Biofeedback, Psychology/methods , Treatment Outcome , Fecal Incontinence/etiology , Biofeedback, Psychology/instrumentationABSTRACT
El objetivo de este trabajo es determinar la eficacia de la biorretroalimentación en el tratamiento de la incontinencia fecal. Entre mayo de 1991 y mayo de 1993 se evaluaron en forma restrospectiva 36 pacientes, con una edad promedio de 58 años; 22 eran mujeres. Las causas de la incontinencia eran: idiopática en 16, trauma obstétrico en 10, post cesárea en 5 y neurológicas en 5. La técnica empleada fue de manometría anorectal y retro alimentación, complementando con un sistema de balones conectados a los esfínteres anales y a la ampolla rectal. Se evaluó la respuesta como curación, mejoría o fracaso terapéutico. 2 pacientes abandonaron el tratamiento. De los 34 restantes, 17 (50 por ciento) se curaron, 15 (44 por ciento) mejoraron y no hubo respuesta (fracaso terapéutico) en 2. Sólo el grupo de pacientes curados demostró una contracción voluntaria completa con significación clínica estadística. Este tipo de tratamiento es eficaz, no traumático y sencillo de realizar por los pacientes con incontinencia fecal
